Tests for matchers package preslavmihaylov#173

Added unit tests for the 3 functions in matchers.go

Author: eisandbar

matchers/matchers_test.go

@@ -0,0 +1,64 @@
+package matchers
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/preslavmihaylov/todocheck/matchers/state"
+)
+
+func TestTodoMatcherForFile(t *testing.T) {
+	testTodo := []string{"// TODO"}
+
+	for extension, factory := range supportedMatchers {
+		t.Run(extension, func(t *testing.T) {
+			matcher := TodoMatcherForFile("test"+extension, testTodo)
+			want := factory.newTodoMatcher(testTodo)
+			if matcher != want {
+				t.Errorf("got %v want %v", matcher, want)
+			}
+		})
+	}
+
+	t.Run("Unsupported extension", func(t *testing.T) {
+		matcher := TodoMatcherForFile("test.md", testTodo)
+		if matcher != nil {
+			t.Errorf("Expected nil matcher")
+		}
+	})
+}
+
+func TestCommentMatcherForFile(t *testing.T) {
+	var testCommentCallback state.CommentCallback
+
+	for extension, factory := range supportedMatchers {
+		t.Run(extension, func(t *testing.T) {
+			matcher := CommentMatcherForFile("test"+extension, testCommentCallback)
+			want := factory.newCommentsMatcher(testCommentCallback)
+			if !reflect.DeepEqual(matcher, want) {
+				t.Errorf("got %v want %v", matcher, want)
+			}
+		})
+	}
+
+	t.Run("Unsupported extension", func(t *testing.T) {
+		matcher := CommentMatcherForFile("test.md", testCommentCallback)
+		if matcher != nil {
+			t.Errorf("Expected nil matcher")
+		}
+	})
+}
+
+func TestSupportedFileExtensions(t *testing.T) {
+	extensions := SupportedFileExtensions()
+
+	for _, ext := range extensions {
+		if _, ok := supportedMatchers[ext]; !ok {
+			t.Errorf("Extension %v is not in supported extensions", ext)
+		}
+	}
+
+	if len(extensions) != len(supportedMatchers) {
+		t.Errorf("Some extensions from supported extensions are missing")
+	}
+}